{{define "cha02/map.html"}}
    <!DOCTYPE html>
    <html lang="en">
    <head>
        <meta charset="UTF-8">
        <title>Title</title>
    </head>
    <body>
    这是map页面 <br>
    {{.map_data}} <br>
    {{.map_data2}}
    </body>
    </html>
{{end}}